Vibration type driving apparatus

a driving apparatus and vibration technology, applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, piezoelectric/electrostriction/magnetostriction machines, electrical apparatus, etc., can solve the problem of insufficient reduction of the size of the vibration type driving apparatus (or the ultrasonic actuator) and the inability to take advantage of non-magnetism

Inactive Publication Date: 2010-03-30
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following problems in the above-described conventional vibration type driving apparatuses.
As a result, it is difficult to reduce the size of a vibration type driving apparatus (or an ultrasonic actuator).
However, a vibration type driving apparatus of such a configuration cannot take advantage of non-magnetism, which is one of the features of an ultrasonic actuator.
However, the shape of the vibrating member or the moving member is complex, so that the size of such ultrasonic actuators cannot be sufficiently reduced.
Furthermore, such ultrasonic actuators are not easy to manufacture.

Method used

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Examples

Experimental program
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Effect test

first exemplary embodiment

[0032]FIG. 1 illustrates a perspective view of a configuration of an ultrasonic linear motor according to a first exemplary embodiment of the present invention. FIG. 2 illustrates a cross-sectional view of the ultrasonic linear motor as seen in a direction of an arrow H in FIG. 1. The ultrasonic linear motor includes a vibrating member 3 formed by a rectangular flat-plate material, and a slider 4 (i.e., a sliding member) that moves relative to the vibrating member 3. The ultrasonic linear motor also includes a plurality of driving units between which the sliding member 4 is disposed, and that controls a moving direction of the slider 4. The plurality of driving units includes a control member 6 and projecting members 5a, 5b.

[0033]The vibrating member 3 has a structure in which an elastic member 1 is formed from a metal plate, and a piezoelectric element 2 (i.e., an electromechanical energy conversion element) is fixed to the elastic member 1 by bonding. In FIG. 2, a shaded portion ...

second exemplary embodiment

[0058]FIG. 10 illustrates a perspective view of an ultrasonic linear motor according to a second exemplary embodiment of the present invention. Components that are the same as those in the first exemplary embodiment are assigned the same reference numerals, and description of such components is omitted.

[0059]In the first exemplary embodiment, the protruding members 5a, 5b are disposed on the nodes 3a and 3c at both sides among the three nodes 3a, 3b, and 3c that are generated in the vibrating member 3. In the second exemplary embodiment, control members 15a, 15b are disposed on nodes 3a and 3c at both sides. A control member 14 is disposed on the middle node 3b. Furthermore, a protruding member (not shown) is fixed on the inner sides of the control members 15a, 15b, similar to the control member 6 in the first exemplary embodiment.

[0060]In the ultrasonic linear motor according to the second exemplary embodiment, the control members 15a, 15b and the protruding member 14 perform ellip...

third exemplary embodiment

[0063]FIG. 11 is a perspective view of an ultrasonic linear motor according to a third exemplary embodiment. Components that are the same as those in the first exemplary embodiment are assigned the same reference numerals, and description of such components is omitted.

[0064]In the first and second exemplary embodiments, the vibration mode in the direction of the longer side of the vibrating member is a two-dimensional bending vibration mode. The third exemplary embodiment uses a four-dimensional bending mode in a vibrating member 16, so that there are five nodes in the bending mode (mode A) in the direction of the longer side. FIG. 12 illustrates the four-dimensional bending mode in the vibrating member 16.

[0065]The length of the longer side of the vibrating member 16 is longer than that in the first and second exemplary embodiments. Moreover, control members 17, 18, 19 and protruding members 20, 21 are disposed in accordance with the rule described in the first exemplary embodiment...

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Abstract

A vibration type driving apparatus includes a vibrating member configured to simultaneously generate a plurality of standing wave vibrations to cause an elliptic motion on surfaces located at nodes of the standing wave vibration, a driving unit formed on the surface located at the node to perform the elliptic motion, and a moving member configured to contact the driving unit and to be driven by the elliptic motion. The driving unit protrudes from a surface of the vibrating member, and includes a first driving unit and a second driving unit that are formed to sandwich the moving member in a perpendicular direction to the surface. The first driving unit and the second driving unit are located at the nodes that are separated by odd-number times a half-wave length of the standing wave vibration, and located where the directions of the elliptic motions are opposite to each other.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a vibration type driving apparatus.[0003]2. Description of the Related Art[0004]Conventionally, there are ultrasonic motors of a vibration type driving apparatus that linearly drive a driven member. For example, Japanese Patent Application Laid-Open No. 06-311765 discusses an ultrasonic motor that excites a plate-like vibrating member with a standing wave having two bending modes to generate elliptic vibration at a predetermined portion of the vibrating member. The ultrasonic motor drives a moving member by bringing the moving member in contact with the predetermined portion.[0005]Moreover, Japanese Patent Application Laid-Open No. 2004-304887 discusses an ultrasonic motor that generates a standing wave having two bending modes that are at right angles to each other to excite a vibrating member having a projection with a raised portion. In such a configuration, an elliptic motion that is...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): H02N2/00
CPCH02N2/0015H02N2/0055H02N2/026
InventorYAMAMOTO, SHINJI
OwnerCANON KK